IMO the PPACA is only the start. I've heard many good ideas out there from both sides about lowering costs while maintaining or improving quality, and most of them are compatible with Obamacare.

But if you don't think uninsured people presenting to ERs is not a significant problem then you didn't read TonyR's article. The evidence is very clear that it is.

The article itself throws out $43 billion or $60 billion as estimates of the cost. Again, against a $3 Trillion market, I can just about guarantee that Walmart loses close to that percentage in "uncompensated" shopping.